Thinking way too much

I'm feeling so overwhelmed I'm reading all these stories on other websites about babies whose heart stopped beating at second trimester or just things that go wrong complications this is my first baby I'm 35 years old and I am so nervous to the point where I don't even feel excited as excited as I know I should be. Does anyone else feel this way? I'm driving myself crazed. My fiance is so mad at me for it. First sono is next week. I'm 6 weeks.